External Micrometer or external micrometer is a measuring tool used to measure the thickness or diameter of objects with high precision. It is usually used to measure the size of objects that are round or workpieces in the production process and quality inspection. This tool is a tool that consists of a measuring rod and a thread, which allows the thickness value to be read in millimeters or inches.
Main components of External Micrometers
1. Sleeve (tube) The part used as a base for the thread attached to the measuring rod, with a scale divided for reading the thickness value.
2. Thimble (twisting thread) The part that rotates to move the measuring head out or towards the workpiece, with a scale divided for reading the value.
3. Measuring Face (measuring face) The part that contacts the object to be measured, which is usually made of a hard and durable material.
4. Locking Mechanism (locking mechanism) Used to store the measured value and prevent changes during reading.
Working principle of External Micrometers
External Micrometer works by using the principle of measuring the distance between two measuring faces. When the object is placed between the measuring faces, both faces are pushed together by rotating the Thimble, which will slide in or out of the Sleeve. When the measurement is complete, the value can be read by combining the values from the Sleeve and Thimble.
1. Setting before measurement Make sure the micrometer is in the correct position, without any obstructions from dust or dirt.
2. Measuring Place the object between the measuring faces and rotate the thimble until the object is firmly seated.
3. Reading Read the value from the sleeve and thimble and calculate the total thickness.
Types of External Micrometers
1. Standard Micrometers are used to measure the thickness and diameter of objects with standard sizes.
2. Digital Micrometers come with a digital display that makes reading easy and fast.
3. V-Block Micrometers are designed to measure objects with irregular shapes, such as wires or curved parts.
4. Depth Micrometers are used to measure the depth of holes or cavities in workpieces.
5. Specialized Micrometers are designed for specific applications, such as measuring the thickness of certain materials.
Uses of External Micrometers
External Micrometers are used in a variety of industries, such as:
1. Manufacturing industry, used to check the size of parts to ensure they are in standard sizes.
2. Maintenance, used to check the size of equipment to be repaired.
3. Research and development, used in scientific experiments to measure the size of different materials.
4. Quality control Used to check the quality of products in the production line
Advantages of External Micrometers
– High accuracy, can measure up to the micron level, making it an appropriate tool for high-precision measurements.
– Easy to use, simple design and can be used without the need for specialized knowledge.
– Durable, the material used to make micrometers is resistant to use and corrosion.
– Easy to carry, small size and light weight, making it easy to use in various places.
Disadvantages of External Micrometers
– Sensitivity to calibration If the micrometer is not properly calibrated, it may affect the accuracy of the measurement.
– Easily damaged If dropped or hit, it may damage the measuring face or distort it.
– Measurement limitations Can only measure objects with thickness or diameter Cannot be used to measure depth in some cases
External Micrometer Calibration
Micrometer calibration is an important step to ensure that the tool can measure accurately. The calibration steps can be done as follows:
1. Using standards Use high-precision standards as a comparison.
2. Check for abnormalities Check if there are any abnormalities in the tool.
3. Record values Record the values obtained from calibration to track performance.
External Micrometers are important tools in high-precision dimensional measurement work. Choosing the right micrometer, including correct calibration It will help to ensure accurate and reliable measurements, which is important in all industries involved in manufacturing, quality control and research.
